UAV Altitude Compressor Assembly With Inlet Motor Cooling
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Solution Overview
Problem
Existing altitude control systems for unmanned aerial vehicles, such as stratospheric balloons, face challenges in efficiently regulating altitude and navigating due to limitations in air compressor design, bearing assembly reliability, and safety features when operating with explosive gases.
Innovation Solution
The proposed system includes a mixed flow air compressor assembly with an inlet-mounted motor, a dynamic axial preloading assembly for the bearing assembly, and enhanced safety features like explosion-proof housings and seals, thermal management, and intrinsic safety measures to prevent ignition of explosive gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor is mounted at the inlet of the compressor, then the compressor efficiency is improved, but the motor heat dissipation becomes more difficult
Solution Approach 1:
The motor is nested within the inlet housing of the compressor, with the motor housing positioned inside the compressor inlet structure. This nesting arrangement allows the motor to be cooled by the incoming air flow while maintaining the efficient inlet-mounted configuration for compression.
Solution Approach 2:
The inlet housing acts as an intermediary structure that channels air flow between the motor and the compression chamber. It serves as a thermal management pathway, allowing cool air to pass over the motor for heat dissipation while directing air into the compression zone.
2Reliability
If a dynamic axial preloading assembly is added to the bearing assembly, then the bearing reliability under varying environmental conditions is improved, but the device complexity increases
Solution Approach 1:
The bearing assembly incorporates a dynamic axial preloading mechanism that automatically adjusts the preload force in response to varying environmental conditions such as temperature changes and operational loads. This dynamic adjustment maintains optimal bearing contact and reliability without requiring manual intervention or complex external control systems.
3Reliability
If explosion-proof housings and seals are implemented, then the safety when operating with explosive gases is improved, but the manufacturing cost and complexity increase
Solution Approach 1:
The compressor assembly is designed with explosion-proof housings and seals that create an inert or non-igniting environment for any explosive gases that may be present. The sealed construction prevents gas leaks and incorporates features that suppress potential ignition sources, allowing the system to operate safely in environments where explosive gases are present without requiring complex active safety systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables more efficient altitude control and navigation of unmanned aerial vehicles by improving compressor efficiency, ensuring bearing assembly reliability under varying environmental conditions, and enhancing safety when operating with explosive gases.
Implementation Method 1
The motor housing may be spaced away from the interior surface, such that air may flow around the motor housing to dissipate heat generated by the motor.
Implementation Method 2
The compressor assembly may regulate an amount of air within the inner envelope.
Implementation Method 3
The impeller may be disposed at an outlet of the compressor housing, with the impeller coupled to a driveshaft for rotation therewith.
Data Source
AI summary
A system for an unmanned aerial vehicle can include an altitude control system 320, which further includes a compressor assembly 400, a valve assembly 500, and an electronics control assembly 600. The compressor assembly may include a compressor housing 410 that includes a compressor inlet 402, an outlet 202, and a cavity 414 extending therethrough and joining the inlet to the outlet. A diffuser 408 may be coupled to the compressor housing. A motor housing 407 may be disposed within the central cavity at the inlet of the compressor housing, and a compressor motor 406 may be disposed within the motor housing. An impeller 412 disposed within the compressor housing may be coupled to a driveshaft 444 for rotation therewith. The valve assembly may be coupled to an opening 416 of the compressor inlet. The valve head 502 may be configured to move into and away from the inlet opening so as to change a size of the circumferential area of the inlet opening.